Real-world outcomes in second-line treatment of metastatic castration-resistant prostate cancer (mCRPC): The Prostate Cancer Registry.

Abstract

5028 Background: The Prostate Cancer Registry is a prospective, international observational study that began in June 2013 and will assess the characteristics and management of > 3000 mCRPC patients (pts) in routine clinical practice for ≤ 3 years. Methods: Data were collected from men with mCRPC irrespective of treatment (tx). This interim analysis reports baseline characteristics, txs and outcomes in pts with ≥ 12-month follow-up receiving second-line mCRPC tx following docetaxel as the only prior mCRPC tx. Results: The most commonly initiated second-line mCPRC txs (n ≥ 50) were abiraterone acetate + prednisone (AAP, n = 177), enzalutamide (ENZ, n = 94), or cabazitaxel (CAB, n = 70). Characteristics and outcomes are shown in the table below. TTP was not significantly different for AAP vs ENZ, AAP vs CAB or ENZ vs CAB (propensity score adjusted p = 0.5954, p = 0.5888 and p= 0.4808, respectively). Conclusions: In this real-world study, clinical outcomes reveal that, in pts receiving second-line mCRPC tx after docetaxel, TTP was similar across tx groups; QoL improved most in AAP and ENZ groups and no deterioration was observed most in AAP and CAB groups. Clinical trial information: NCT02236637. [Table: see text]